Today while taking a shower I noticed a dark bruise that appears to be under the skin deeply (not really dark on the surface, but blue several layers down) in an oval shape about he size of a lemon just below the sternum (mid torso) area. I have been very inactive the last few days due to a cold I've been nursing and can't think of anything that I couldv'e done to injure this area.
What could be the cause? I have some pain and discomfort in that area as well as my back. Should I be concerned or just let it go?
Thanks in advance,